This map shows the location of geodetic points in Quebec. It is available in the form of an interactive map and downloadable vector files. The location of the points is based on the approximate coordinates (± two meters). The geodetic network consists of approximately 112,000 landmarks grouped under six themes: * Permanent GNSS stations; * The 3D precision network; * The planimetric network; * The altimetric network; * The altimetric network; * The points presumed destroyed or damaged; * The points presumed destroyed or damaged; * The destroyed points. The vector product contains the following information: * The original number; * The serial number; * The status of the geodesic point; * The theme to which it belongs. The ** [interactive map] (https://geodesie.portailcartographique.gouv.qc.ca/) ** offers more information and provides access to the associated data sheet. # #Bases calibration for electronic rangefinders To allow rapid and effective control of distance measuring instruments (electronic rangefinder), a network of permanent calibration bases has been established in the main regions of Quebec. Information relating to each of the bases, including inter-pillar distances, can be obtained by clicking below on the name of the municipality where the base is located: * [Chambly] (https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Bases_Etalonnage/Chambly.pdf) * [Mont-Joli] (https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Bases_Etalonnage/Mont-Joli.pdf) * () * [Neuville] () * [Neuville] (https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Bases_Etalonnage/Neuville.pdf) * [Port-Cartier] ( https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Bases_Etalonnage/Port-Cartier.pdf) * [Saguenay] (https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Bases_Etalonnage/Saguenay.pdf) * [Terrebonne] (https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Bases_Etalonnage/Terrebonne.pdf) * [Terrebonne] (): the calibration base no longer exists * [Trois-Rivières] (https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Bases_Etalonnage/Trois-Rivieres.pdf) * [Val-d'Or] ( https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Bases_Etalonnage/Val_d_Or.pdf)**This third party metadata element was translated using an automated translation tool (Amazon Translate).**

The GNSS (Global Navigation Satellite System), or satellite positioning system, includes all satellite navigation systems. It allows you to know your location, anywhere in the country. Theoretical GNSS specifications estimate the accuracy of the position obtained from a receiver to be approximately 15 meters in planimetry and 25 meters in altimetry. By combining the data with that of another receiver placed on a known geodesic point, the accuracy of the obtained position can vary from a few centimeters to a few meters, depending on the type of receiver used. In order to increase accuracy, the Government of Quebec records data continuously through a network of 18 GNSS stations. These stations are located on geodetic points that are free of any obstacles and capture data from the GPS and GLONASS constellations. Some of these stations receive signals from the Galileo constellation. This data is available in the standard exchange format*Receiver Independent Exchange Format* (RINEX), version 2.11. This format is recognized by the majority of GNSS data processing software. The data is accessible on the __ [ftp server] (ftp://ftp.mrn.gouv.qc.ca/Public/GPS)__) of the MRNF or using the __ [Interactive Map] (https://geodesie.portailcartographique.gouv.qc.ca/)__) of the geodetic network. It should be noted that only data from the last 366 days is kept. The structure of the directories and files on the __ [ftp server] (ftp://ftp.mrn.gouv.qc.ca/Public/GPS)__) as well as the coordinates of the stations are presented in the document __ [GNSS sensor stations] (https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Stations_GNSS.pdf)__. # #État of GNSS stations## You can consult the status of the stations in the document __ [Status of GNSS stations] (https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/État_Stations_GNSS.pdf)__. You will be notified if a station is in service, out of service, or if equipment maintenance is planned. # #GNSS in real time by cellular telephony The government also offers GNSS data by cellular telephony that allows centimeter positioning work to be carried out in real time. Users of georeferenced data can thus, with a single multi-frequency GNSS receiver equipped with a modem by cellular telephone, identify or implement any physical detail with an accuracy of a few centimeters in the NAD 83 reference system (SCRS) (period 1997.0). The signal that contains this data is available to everyone. The range depends on telephone coverage, ionospheric conditions and especially on the instruments used. For more information on using GNSS in real time, see document __ [Guidelines for GNSS RTK/RTN Surveys in Canada] (http://publications.gc.ca/site/fra/9.822883/publication.html)__. # #Détails techniques The transmission of GNSS data as well as the station's NAD 83 (SCRS) coordinates (era 1997.0) is transmitted by cellular telephony from an IP address on the Internet. Each station transmits its data in one of the following two formats: CMR+ or RTCM V3.2. The document __ [GNSS capture stations] (https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Documentation/Geodesie/Stations_GNSS.pdf)__) gives for each city the IP address of the CMR+ or RTCM V3.2 formats as well as the antenna model. It should be noted that the data is not broadcast according to the*Networked Transport of RTCM protocol via Internet Protocol* (NTRIP).**This third party metadata element was translated using an automated translation tool (Amazon Translate).**

Mileage markers, also often called kilometer markers, allow road users and safety workers to use road signs to locate on the road network. Mileage markers are installed on all motorways and they can also be installed on other classes of roads (e.g. national road) where there are tracking problems or an absence of services.**This third party metadata element was translated using an automated translation tool (Amazon Translate).**